The TJ Wrangler brought back the iconic round Jeep headlights that hearkened back to the CJ model, but the biggest changes came underneath. Gone were the leaf springs of yesteryear, a modern coil spring-based suspension in their place. This further improved the Wrangler's on-road manners while retaining its off-road capability. If that inline-4 or 6-cylinder isn't getting the job done for you, check out our Gen III/IV LS swap systems.